Observed and urbanization-adjusted annual maximum peak discharge and associated urban fraction and precipitation values at USGS streamgage:
05528150 INDIAN CREEK AT DIAMOND LAKE, IL

Observed annual peak-flood magnitudes were adjusted to 2010 land-use conditions on the basis of panel data regression model with fixed effect analysis. The symbols presented in the figure are: "observed annual peaks", "adjusted annual peaks", and "fraction of urbanization in the watershed"

Legend for Graph

Water year Segment Discharge code Cumulative reservoir storage (acre-feet) Urban fraction Precipitation (inches) Observed peak discharge (ft3/s) Adjusted peak discharge (ft3/s) Exceedance probability
1960 1 -- 2070 0.147 0.500 1150 2020 0.011
1961 1 -- 2070 0.150 1.215 111 381 0.908
1962 1 -- 2070 0.152 0.261 466 949 0.160
1963 1 2 2070 0.155 1.259 67 290 0.965
1964 1 -- 2070 0.158 1.733 80 321 0.952
1965 1 -- 2070 0.160 0.565 306 703 0.418
1966 1 -- 2070 0.163 0.476 280 656 0.486
1967 1 -- 2070 0.166 0.924 284 662 0.478
1968 1 -- 2070 0.168 1.248 80 317 0.954
1969 1 -- 2070 0.171 1.342 406 835 0.237
1970 1 -- 2070 0.174 1.511 590 1150 0.080
1971 1 -- 2070 0.181 0.415 375 789 0.294
1972 1 -- 2070 0.188 1.198 417 841 0.230
1973 1 -- 2070 0.195 1.436 386 796 0.284
1974 1 -- 2070 0.202 1.114 306 679 0.453
1975 1 -- 2070 0.210 1.115 174 461 0.804
1976 1 -- 2070 0.217 1.257 403 807 0.270